Visitor is a behavioral design pattern that allows adding new behaviors to existing class hierarchy without altering any existing code.
Read why Visitors can't be simply replaced with method overloading in our article Visitor and Double Dispatch.
Application of the pattern in C#
Usage examples: Visitor is not a very common pattern because of its complexity and narrow applicability.
Example: Structure of the Pattern
This example illustrates the structure of the Visitor design pattern. It focuses on answering these questions:
- What classes does it consists of?
- What roles do these classes play?
- In what way the elements of the pattern are related?
Program.cs: Structural Example